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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3746614a3c77109cd3c98adae6306c587e55981f94a0028950c5b1e73d357ed0' 
  AND token = '2f1IuwcXRNF8Qpp48xCbtJ91WHDhteoU1f+n0tQpUTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}